UPDATE FOR EXPANSION 9/6: The Expansion team has updated how the Exchange works. Only your Market.json file that you wish to have be your exhange file, you would need to make the applicable category.
Update to my currency tutorial. It goes over how to swap the default gold and silver for the alternate currencies now included with Expansion Market.
I also go over a few different ways to use the Exchange options. (hint: you don't need them if you are only using one type of currency)
My DayZ Server info is on my Discord: / discord